Governing device for automatically controlling the supply of feed-water to steam-boilers and for like purposes.



A. R. TRIST. GOVERNING DEVICE FOR AU TQMATICALLY CONTROLLING THE SUF PLY 0F FEED-WATER T0 STEAM BOILERS AND FOB LIKE PURPOSES. APPLICATION FILED um: 12. 19M.

, Patented Jan. 1, 1918.

3 SHEETS-SHEET l.

A TTY APPLICATION FILED JUNE 2. I914.

' A AWE 3 I gm A. R. TRIST.

-GOVERN|NG DEVICE FOR AUTOMATICALLYCONTROLLING THE sumv or mo WATER T0 sum BOILERSANDFORUKE PURPOSES.

Patel; Jan.1 1918 3 SHEETS-SHEET Z.

. TRIST.

R LLING THE SUPPLY OF FEED WATER T0 STEAM GOVERNING DEVICE FOR AUTOMATIGA N BOILERS AND F KE M'PLICATlO'N FILED IUN PURPOSE Patented Ja11.1,1918.

s SHEETS-SHEET 3.

mamas,

TA ES."

ATE T QFFICE- AR HUR 2301mm CHRIST, or LONDON, ENGLAND.

GOVERNING nEvIoE r03 AUTOMATICALLY merge t-me 'lI-IE sUrrLr'oF' F E -,1; WATER To-sTEAr/r-BoILn Rs AND FOR LIKEPURPosEs. "i

Application filed June 12, 1914. Serial No. 844,755.

jToall'whom'it mdyconcem: Be it known that I, ARTHUR RONALD TRIST, subject of the King of Great Britain.

and Ireland, residing at 4 Lloyds avenue, 5 inthe city of London, England, haveinvented new and useful Improvements in and Relating to Governing. Devices for Automatically Controlling the Supply of Feed- Water to Steam-Boilers and for like Purv poses, of which the following isa specifica-.

has obtained and this invention has for its object the complete automatic control without any risk of hunting taking place and such control can be elfectively arranged within a very small range of pressure.

The invention consists in the construction of a pressure controlled device provided with means by which the said, controllingdevice is held in check for small variations in pressure, so that it does not immediately respond thereto, and isv thus prevented from any hunting effect on :the device controlled. a In order that the inventionmay be the better understood. I will now'proceed to de scribe the same in relation to the accompanying drawings. reference being had to the letters and. figures, marked thereon.

Like letters refer to like parts in the various figures in 'Which "Figure 1 shows the general arrangementv of apparatus for feeding a battery of boilers from one feed pump with my invention applied thereto, only one boiler of the battery being indicated. i v

Fig. 2 is a sectional view with parts shown in elevation of an apparatus constructed in accordance with mv invention.

Fig. 2 is a similar view to Fig. 2, butshowing the parts in different positions.

Fig. 3 is a part side elevation showing the detent gear.

' Fig, 4' is a detail View showing the valves andxtheir associated'parts on an enlarged scale 1 Y I To show how the. invention can be carried into veli'ect, I will describe it in relation to .a steam pun'ip a feeding a batteryof boilers of which'one boiler b is shown, the pump being controlledby the pressure in the feed main 0 as totherate of itsoperationL To the feedinain 0 between the pumpaand 65. the boiler 19 is connected a 'powerdeviced" having apistonc 'or the like adapted ton operate against an adjustable yielding. resist, ance such as aspring f acting iinoppiosition to the feed water pressure so that as the -70.?

pressure in the feed main 0 rises, the piston 6 moves against the yielding resistance of thespring f. and the piston rod 9 is adaptedto contact with a stem swhich carries atits lower part valves h andh These valves it? and 71B are disposed each side of and adapted to co-act with a valve-seat member:

h and controlthe valve vz ofthe'steam supply pipe 70' to the pump a through the medium of the power device Z. I'prefer to arrange-the valve z' to be operated by a' power devicefll' comprising :a piston and; cylinder. similar to that hereinbefore described and also fitted with some form of yieldingresist'ancesuch as springs m which 851- will return the power device Zto'its initial positionwhen the operating pressure is cut off therefrom consequent upon the control: valves b and k beingjoperated byythe power device. cl ,under the action of the pres; sure of'thefeed main 0. ,After the power; device d has. been operated the ,control valves 71, andh are kept in such a position so as to maintain the supply of steam from the pipe 70 to the .power device Zof thevalve 9.5.: c by means'ofa detent n pivoted at-o on the, frame and spring pressed by spring p, the. nose 9 of'the detent it automatically engaging with an abutment r carried by the stem 8 of the control valves 72, and k UponlOO the piston rod '9 of the power'device 0Z1, arrange a cross head ct carrying a rolling surface a on eachl side adapted-to 'co-act; with rollers a pivoted on the detent n so that on the outward stroke of the power device (Z, the surfaces .u recede from-zzthe pressure in the feed main 0 drops the roller a: on the cross head If gradually withdraws the nose q of the detent n from co-action with the abutment 7 thus releasing the control valves 72, and k which under suitable pressure such as from springs to moves so as to close the valve k to the passage of'main steam to the power device Z and open the valve h to the exhaust 00 so that the valve 6 opens and steam is again admitted to the pump a. In order that the apparatus can be worked through very narrow limits, the crosshead t isadapted to be adjustableon the piston rod 9 and the abutment r is ad justa'bly fixed on the stem 8.

By this arrangement, it is possible not only to adjust in the simplest manner the critical terminal pressure which will operate the control valves 72 and k to the pressure which will operate the power device Z of the valve 2' but also. to regulate the drop in pres sure that it is found in practice to be desirable to allow as a suitable range within which the valve 2' should be moved from the all open position to the completely is not exhausted when the crosshead. 27

reaches its lower terminal position,

It will be understood that inv Fig. l I have shown a power operated feed check valve y controlled by afloat device 2 as part of the usual equipment of a battery of boilers which has been put in to complete the automatic features of the arrangement described. I may reverse the action of the valves i't and h by making the passage communicating with the pipe :0 the steam supply, and the passage communicating with the pipe is the exhaust outlet, in order to efl'ect the 'par ticular purpose in view which may be under different circumstances 'tothose of which the device shown in the drawing worksunder. 7 r

' Having thus fully described my invention, I claim as new and desire to secure by Letters'Patent:' p p i 1. A governing device 'for automatically controlling the "supply of fluids by the pres sure of supply comprising in combination, a power device in connection with the supply pressure, a yielding resistance adapted to operate in opposition to said power device, a

fluid operated control device controlling the operation .of the supplyingdevice of fluid under pressure adapted tov co-act'with said power device, an automatlc positively locking retaining device for maintaining. the

able part ofthe powerdevice'adapted to withdraw the said retaining device 'from'its locking co-action with the control device when a. given variation of pressure of the fluid under supply has'been attained, sub stantially as described.

2. A governing device for automatically controlling the supplyot fluids by the pres sure of supply comprising in combination a cylinder in connection with the supply pressure, a piston in said-cylinder, a spring adapted to act on said piston against the supply pressure, a fluid supply device, a control device, controlling the supply of energy to the fluid supply device, an independent retaining device adapted to positively lock the control device in its inoperative position after maximum motion of the said piston and a releasing device carried by the piston orits rod adapted to withdraw the positive lock of the retaining'device on a given variation of pressure of supply, sub st-antially as described.

3; A governing device for automatically controlling the supply of fluids by the pressure of supply comprising in combination a power device in connection with the supply pressure, arelay controldevice operated by the said pressure adapted to control external energy, second power device oper ated by said external energy, a control device operated by sai-dsecond power device for controlling the energy transmitted to the fluid supplying device and an automatic positively locking retaining device for maintaining'the relay control device in the position for admitting fluid pressure'to thesaid second power device in order to cut off the" energy to the said fluid supplying device, substantially as described; In testimony whereof I-h'ave signed any name to this specification in thje'presence of two subscribing witnesses. i ARTHUR 'RGNALT) s Witnesses: air: '1."

[WALTER CARVEL,

JAM-neon;

Copies of this patent may .be obtained for five cents each, by addressing the 'Hflbmmissi'oner of iPatent-sg 'E D. c I .P r HY" 

